Filtering medium



Feb. 2 9

E. M. KNIGHT FILTERING MEDIUM Filed June 9, 1922 To all whom it may concern:

Be it-known I that I, EDWARD MARTIN' UNITED PA ENT nnwann m. xinenr, or 'Bnooxrnm, mew Yonx.

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KNIGHT, a citizen of the United States, and residing at 467 Vanderbilt Avenue, Brooklvn, in the county'of Kings and State. 0f

sheets to adhere, and thereby give w York, have invented certain new and useful Improvements in. a Filtering .Medium, ofiwhich the following is a clear and exact specification.

This invention relates to filtering media for use in filters intended for purifying water, and my present improvement, which comprises a development of my earlier Patent No. 1,318,388, includes a new product constituting a filtering element and also the steps employed in the process whereby this product is created.

In my said earlier patent I have disclosed a filtering medium composed of two superimposed sheets of fibrous material with an intermediate laver of carbon, the sheets of fibrous material being clamped together at their edges to thereby contain the carbon.

Further e riments conducted by me have resulted in the formation of the superimposed sheets into an interlocking cellular structure which divides the area of the medium into a number of carbon containing pockets and thereby preventsthe dispersion of the carbon contents.

The new product therefore consists of two sheets of fibrous material with an intervening layer of carbon the whole structure being moulded into a number of separate cells to localize the carbon contents; and the steps leading to the production of this product consist in applying a thin layer of carbon, either in owdered or paste like form, u on a sheet of fibrous material; placing anot er sheet of fibrous material upon the exposed carbon; placing the ply elements upon a yielding1 surface, and then applying a male die wit pressure to impres into the ply material a series of right angular de essions, thereby interlocking the fibres o the sheets and providing cells which confine the carbon.

The carbon, as formed into a paste or mass for convenience in applying it to the surface of one of the sheets. mayinclude theadmixture of a suitable adhesive as a binder, which will cause the superimposed permanency to the cellular formation.

Other features and advantages of myainvmtion will hereinafter appear.

m2.v Serial in; 567,816.-

In the drawings: I v

Figure 1 is a lan view of my improved filtering medzium.

Fig. 2 is' a plan view of one of the absorbent sheets before it has been moulded.

Fig. 3' is a plan view of anotherabsorbent sheet lpon which'a filmof carbon has beenplace Fig. 4 is a partial view of a mould comprising a flexible-base which serves as a matrix and a male die member to co-act therewith, and i Fig. 5 is a section on an enlargedscale on the line 5-5 of Figure 1.

In carrying out my invention for the production of the improved filtering medium I employ two sheets of fibrous material, as

indicated respectively at 1, 2. While these sheets are shown as of circular outlines, they may be of other suitable shape.

Upon a surface of one of these sheets, as 1, I place a film of carbon, 2, which may be in the form of. powder or a aste. If 1n paste form then the liquid use may include a suitable adhesive. The other sheet, as 2, is then placed over the carbon film, and then the two plv material with its carbon filling is pressed in. a mold which imparts a cellular structure thereto, indicated by the crossed depressions 3, 4. and the cells 5.

The mould employed by me for the purpose comprises a matrix 6, consistin of a flat surfaced pad of yielding material, such as rubber, and a male die member 7 having on its surface the crossed ribs 8 that impress the two ply sheet material with their contour when pressing against the yielding matrix, and thereby impart the cellular form to the sheet material which is the essential feature of the invention.

In this way a construction is obtained which will maintain the carbon film in unbroken form and prevent the crumbling or disintegration thereof in transportation or by rough handling. or the use of the disk in a perpendicular position in a filter.

While the cells thus created for confining the carbon are here shown as rectangular in outline, they may obviously be given other shapes without departing from the spirit of my invention.

Variations within the spirit and scope of my invention are the foregoing disc] I claim I As a new article of manufacture a filter equally comprehended by I in which the layers of material are designed to be maintained in a vertical sition, comprising three layers of material, consisting of two outer vertical layers of fibrous material and one interposed layer of carbon, the whole being pressed and indented along certain lines on one side, thereby formin cells on the opposite side, the walls of t e indentations of thecarbon layer followmg 10 closely the indentations of the fibrous material whereby a contacting locking means'is.

provided for the carbon layer so that the thickness of the combined la ers is'uniform throughout, a maximum filtering surface provided, and the carbon layers secured fromdis lacement and disintegration.

Signe at the borough of Manhattan, in the city, county and State of New York, this 5th day of June, 1922.

EDWARD M. KNIGHT. 

